Thermostatic duct adjustment

I have a server cooling dilemma. The 3 ton rooftop HVAC that cools the server room also cools 2 other rooms. The server room needs more or less cooling depending on load and season. The 2 other rooms end up freezing when the servers are working hard but are fine when the servers are at idle. If the vents are shut to the non-server rooms they get too hot.

Question: Is there a thermostatically controlled vent or duct that can pinch off flow to the non-server rooms when they reach a comfortable temp? I figured 2 adjustable vents and 2 more thermostats to adjust them. Please understand, I realize balancing these systems is an art and that what I'm suggesting is using a sledge hammer to fix it.

Thermostatic duct adjustment

they have motorized registers that would replace the exsisting on the non-server room 24V and stat and your controlling the space.the dampers are not air dependent and basically would be moving/modulating even if the unit is off..then close when the statis satisfied....will hunt them and get back....

Thermostatic duct adjustment

After posting, of course, I searched using the right terminology "damper". This, as you know, got the hits I was looking for. The Honeywell system seems to be well sorted out (and a little pricey). Thanks for all your replies. Glad to be part of a forum with active members.

Thermostatic duct adjustment

Make sure you get a reputable professional to do your work. The drawbacks are that when the non server dampers close the velocity and noise of the air in the server room will increase. This can also overload the fan and cause potential freezeup of the A/C coil and overheat the furnace part if it has one. You need to make sure or the Pro does that there are no freezeup problems when reducing the airflow and even barometric damper setups are not perfect. The ideal setup is separate units for the 2 different areas. Minisplit units are popular for server rooms:Fujitsu Ductless Mini-Splits: Wall Mounted Systems

Thermostatic duct adjustment

Quote:

Originally Posted by biggles

they have motorized registers that would replace the exsisting on the non-server room 24V and stat and your controlling the space.the dampers are not air dependent and basically would be moving/modulating even if the unit is off..then close when the statis satisfied....will hunt them and get back....

Only problem with that method. Is that if both of the non server rooms have their dampers closed. Then the air flow will be too low. Probably freeze up the evap coil. End up with the server room over heating. And flood back the compressor and probably damage it.

Zoning systems. While more expensive. Have safeties to protect the HVAC equipment.

Thermostatic duct adjustment

Quote:

Originally Posted by beenthere

Only problem with that method. Is that if both of the non server rooms have their dampers closed. Then the air flow will be too low. Probably freeze up the evap coil. End up with the server room over heating. And flood back the compressor and probably damage it.

Zoning systems. While more expensive. Have safeties to protect the HVAC equipment.

The server room has 2-12" ducts going from the main distribution manifold, or whatever it's called, to the room. The HVAC is shooting to 2 rooms. I only need to close one of the 3 - 12" ducts. There are no restrictors or dampers on the server rooms registers, just diffusers. The reason I'm in the DIY section is because we can't afford a pro right now. We have to squeak by on our wits. We are pro's at what we do and hate when people try to do our jobs too, so I understand but we have no choice right now. I'll take all of your warnings seriously. Thank you very much for your time.